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Related Concept Videos

Hydration of Cement01:24

Hydration of Cement

Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...

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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
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A pH-Responsive Hydrogel for Bioactive Self-Healing Cementitious Materials.

Shuai Nie1, Dmitriy Berillo2,3, Fabian Steinacher2

  • 1Aarhus University, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Langelandsgade 140, 8000 Aarhus C, Denmark.

ACS Omega
|May 18, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed pH-responsive hydrogels from N,N-dimethylaminoethyl methacrylate (DMAEMA) to encapsulate bacteria for self-healing concrete. The N7 hydrogel demonstrated excellent swelling and supported bacterial growth, showing promise for advanced construction materials.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Civil Engineering

Background:

  • Self-healing cementitious materials utilize microbially induced calcium carbonate precipitation to repair cracks.
  • Effective healing requires protective carriers that maintain microbial viability and activity within the cement matrix.

Purpose of the Study:

  • To synthesize and evaluate pH-responsive superabsorbent hydrogels based on N,N-dimethylaminoethyl methacrylate (DMAEMA) as carriers for microbial agents in self-healing concrete.
  • To identify hydrogels with optimal swelling properties and biocompatibility for bacterial encapsulation.

Main Methods:

  • Synthesis of nine DMAEMA-based superabsorbent hydrogels.
  • Evaluation of pH-dependent swelling behavior in the alkaline range (pH 8-13).
  • Assessment of hydrogel biocompatibility and support for bacterial growth (Clostridium paradoxum).
  • Characterization of hydrogel structure using FTIR and 13C MAS NMR.

Main Results:

  • Three DMAEMA hydrogels exhibited pH-dependent swelling between pH 8 and 13.
  • The N7 hydrogel (DMAEMA:DMAAm:PEGDMA, 10:20:1 molar ratio) showed significant swelling (25x at pH 8, 7.5x at pH 13).
  • The N7 hydrogel demonstrated a consistent elastic modulus (40 kPa) and supported the germination and proliferation of Clostridium paradoxum endospores.
  • In situ polymerization was biocompatible.

Conclusions:

  • A novel biocompatible, pH-responsive DMAEMA hydrogel (N7) was successfully synthesized.
  • The N7 hydrogel exhibits excellent swelling properties and supports bacterial viability, making it a promising carrier for self-healing cementitious materials.
  • This hydrogel has potential applications in enhancing the durability and longevity of concrete structures.